On Wed 2018-06-27 23:16:12, Sergey Senozhatsky wrote:
> On (06/27/18 16:08), Petr Mladek wrote:
> > The commit 719f6a7040f1bdaf96 ("printk: Use the main logbuf in NMI
> > when logbuf_lock is available") brought back the possible deadlocks
> > in printk() and NMI.
> >
> > This is rework of the proposed fix, see
> > https://lkml.kernel.org/r/20180606111557.xzs6l3lkvg7lq3ts@xxxxxxxxxxxxxxx
Grr, the right link is
https://lkml.kernel.org/r/20180608104825.e7xoxteelaxnwx66@xxxxxxxxxxxxxxx
> > I realized that we could rather easily move the check to vprintk_func()
> > and still avoid any race. I believe that this is a win-win solution.
> >
> >
> > Changes against v1:
> >
> > + Move the check from vprintk_emit() to vprintk_func()
> > + More straightforward commit message
> > + Fix build with CONFIG_PRINTK_NMI disabled
>
> Did I miss out V1?
It is the above fixed link. I am sorry for the confusion.
> > Petr Mladek (3):
> > printk: Split the code for storing a message into the log buffer
> > printk: Create helper function to queue deferred console handling
> > printk/nmi: Prevent deadlock when accessing the main log buffer in NMI
>
> Patch 3/3 is not in my mailbox, somehow [I checked the spam folder].
> I'm not Cc-ed or the message got lost somewhere before it reached my
> gmail?
Ah, the following line somehow confused git send-mail and the message
had broken list of recipients:
Cc: stable@xxxxxxxxxxxxxxx # 4.13+
I have sent it once again as you have already noticed.
Best Regards,
Petr
